Show A BAR OP OF GOLD uncle sam la Is preparing a standard standard of puro pure gold it will take the form of of a bar weighing fitly fifty tola this bur bar wilt will be cut into several pieces one of 0 which will bo be given to each cacti of toa the U 8 mints and fitsay ownes ofil ces A slice will also bo be sent cent to england for comparison with the british standard ol of puro pure szold gold it il seems that no co ah absolute solute pure gold eola has ever been produced cou country 11 at all events which th there ere con can te be certainty tho standards now navy possessed by the various mints differ somewhat not one oagot of them la Is surely free from impurity for far the purpose of exactness in assay asay work it Is desired to hate a standard that is OB as crisari Cro Cie sari sars wife should be bayona suspicion the bar that Is to bo be Is now a liquid too fifty ounces of gold oro are in a chemical solution at the jhb mint in philadelphia the atto yellow metal thas th as js dissolved wa extra fine to begin with having only one oae tenth of one per cent of impurity the impurity was wa chiefly silver thit kold was rolled to very thin sheets and then put into a tank ol of aqua regia and ana sold nold tho the solution of gold made la in this way was diluted with twenty gallons of distilled tilled water in that condition it govro no v remains a this thin but precious liquor voder under the ho action of tho the add acid the sliver silver falls down to the bottom of the took tank in a white while loud load at the and of 0 a month the plear 0 ear liquid will be drawn oft carefully in into to flask without stirring so 0 as to leave the silver impurity behind sulphurous acid gas will then ihen bo be passed through the solution baua arg it to throw down adwa the pure alic a gold but many processes havo have yet to be gone before the cold will bo be considered pure it will bo be washed in u porcelain crucible and nade made into dro acid dissolved in ID rcola evaporated almost to dry dryness noss dil diluted atod with water and precipitated in me metallic tallia form by sold all this will then bo be repeated finally the gold will be collected melted in a porcelain crucible and mado lot into on a bar baft tha piece of the bar that la Is sent ont to each will bo be compared by chemical tests with the standard ot of pure gold now used et at that dint |